A study of various populations around the world (including males & females from e.g.: the US, China, India, the Netherlands and Japan) reveals that the average human 'hand index' is close to 0.44.

But one has to be aware that 'hand index' varies among populations with sex and body length:
- Males typically have a higher 'hand index' (average close to 0.45), and females typically have a lower 'hand index' (average close to 0.43);
- Tall populations have a higher 'hand index' (average for Dutch males + females is close to 0.45); small populations have a lower 'hand index' (average for Japanese males + females is close to 0.43).